On the left is the ergonomic AttackPAK frame, weighing about 1 pound. It protects the user from crushed spine, protruding equipment and numbness in the hands.
The frames to the right are current military frames that range from 1.2 pounds to almost 3.5 pounds. Most users don't use a waist belt because it hinders mobility and makes the pack dangerously slow to ditch. The result is spinal injury and chaffed back from the back ballistic plate digging in. When backpack weight hangs on your shoulders the front ballistic plate crushes your chest restricting breathing, reducing performance, putting soldiers at risk.
The soldier's equipment burden clearly needs to be reduced, but it is also critical to improve equipment design to incorporate ergonomics and biomechanics.